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In a Wikipedia article, the blue text represents any linked text. For the most part, these links exist to bring a reader from one Wikipedia article to another.

If you were reading about Chemistry Sets but then realized what you actually wanted to be reading about were other educational toys, you could click the "Educational Toy" blue link (see image) and follow it to that Wikipedia page.

A red-link means that the topic mentioned (in this example below, the Toy Safety Act) does not yet have a Wikipedia article. When that article is created, if the title becomes Toy Safety Act that red link will automatically be updated to a blue one.

An article on Wikipedia that does not link to any other article on Wikipedia is called an orphan.

In order to make sure that any article you're editing can be found my other editors, you should add links and categories. To add a link using the VisualEditor follow these steps:

Select "Edit" on the article and then highlight the word or phrase you want to link. In the example below, the word is "copper".

Then, click the link icon above (it looks like a paperclip). This will open up a list of Wikipedia articles related to your highlighted term.

Scroll through the list until you find the article that you want to link to. Select that article. The word you highlighted should now be blue.